Achieve passwords in Key

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I have a bit under 300 sites/passwords stored in Key, and it's getting quite clumsy to use, especially in mobile.

 

Many of those websites/-services are ones that I'm not using anymore, but they don't allow removing user account or for some reason, I want to keep my account existing.

 

It could be great to be able to achieve those passwords so that they wouldn't appear in every view in Key.

 

I saw some people suggesting folders for passwords in LastPass-style. That wouldn't solve this issue, since especially in mobile, choosing login from list would be even slower with categories.